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To: sdl@libsdl.org From: Staffan Ulfberg <staffan@ulfberg.se> Date: 19 Nov 2005 01:00:48 +0100 Subject: [SDL] New driver for OpenBSD/wscons Hello, I've written an SDL driver for OpenBSD/wscons (console mode, somewhat resembling the functionality of the svga driver for Linux). I use it for playing MAME on my Sharp Zaurus. The alternative is to play under X, which is slower. I asked how to submit the driver a few days ago, and posted a link to the patch in a follow-up, so maybe it was missed? Anyway, the patch is on the web at: http://multivac.fatburen.org/SDL-wscons.patch Comments? Staffan
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 22 Nov 2005 15:19:50 +0000
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1 ==============================================================================
2 Using the Simple DirectMedia Layer with OpenBSD/wscons
3 ==============================================================================
4
5 The wscons SDL driver can be used to run SDL programs on OpenBSD
6 without running X. So far, the driver only runs on the Sharp Zaurus,
7 but the driver is written to be easily extended for other machines.
8 The main missing pieces are blitting routines for anything but 16 bit
9 displays, and keycode maps for other keyboards. Also, there is no
10 support for hardware palettes.
11
12 There is currently no mouse support.
13
14 To compile SDL with support for wscons, use the
15 "--enable-video-wscons" option when running configure. I used the
16 following command line:
17
18 ./configure --disable-oss --disable-ltdl --enable-pthread-sem \
19 --disable-esd --disable-arts --disable-video-aalib \
20 --enable-openbsdaudio --enable-video-wscons \
21 --prefix=/usr/local --sysconfdir=/etc
22
23
24 Setting the console device to use
25 =================================
26
27 When starting an SDL program on a wscons console, the driver uses the
28 current virtual terminal (usually /dev/ttyC0). To force the driver to
29 use a specific terminal device, set the environment variable
30 SDL_WSCONSDEV:
31
32 bash$ SDL_WSCONSDEV=/dev/ttyC1 ./some-sdl-program
33
34 This is especially useful when starting an SDL program from a remote
35 login prompt (which is great for development). If you do this, and
36 want to use keyboard input, you should avoid having some other program
37 reading from the used virtual console (i.e., do not have a getty
38 running).
39
40
41 Rotating the display
42 ====================
43
44 The display can be rotated by the wscons SDL driver. This is useful
45 for the Sharp Zaurus, since the display hardware is wired so that it
46 is correctly rotated only when the display is folded into "PDA mode."
47 When using the Zaurus in "normal," or "keyboard" mode, the hardware
48 screen is rotated 90 degrees anti-clockwise.
49
50 To let the wscons SDL driver rotate the screen, set the environment
51 variable SDL_VIDEO_WSCONS_ROTATION to "CW", "CCW", or "UD", for
52 clockwise, counter clockwise, and upside-down rotation respectively.
53 "CW" makes the screen appear correct on a Sharp Zaurus SL-C3100.
54
55 When using rotation in the driver, a "shadow" frame buffer is used to
56 hold the intermediary display, before blitting it to the actual
57 hardware frame buffer. This slows down performance a bit.
58
59 For completeness, the rotation "NONE" can be specified to use a shadow
60 frame buffer without actually rotating. Unsetting
61 SDL_VIDEO_WSCONS_ROTATION, or setting it to '' turns off the shadow
62 frame buffer for maximum performance.
63
64
65 Running MAME
66 ============
67
68 Since my main motivation for writing the driver was playing MAME on
69 the Zaurus, I'll give a few hints:
70
71 XMame compiles just fine under OpenBSD.
72
73 I'm not sure this is strictly necessary, but set
74
75 MY_CPU = arm
76
77 in makefile.unix, and
78
79 CFLAGS.arm = -DLSB_FIRST -DALIGN_INTS -DALIGN_SHORTS
80
81 in src/unix/unix.max
82
83 to be sure.
84
85 The latest XMame (0.101 at this writing) is a very large program.
86 Either tinker with the make files to compile a version without support
87 for all drivers, or, get an older version of XMame. My recommendation
88 would be 0.37b16.
89
90 When running MAME, DO NOT SET SDL_VIDEO_WSCONS_ROTATION! Performace
91 is MUCH better without this, and it is COMPLETELY UNNECESSARY, since
92 MAME can rotate the picture itself while drawing, and does so MUCH
93 FASTER.
94
95 Use the Xmame command line option "-ror" to rotate the picture to the
96 right.
97
98
99 Acknowledgments
100 ===============
101
102 I studied the wsfb driver for XFree86/Xorg quite a bit before writing
103 this, so there ought to be some similarities.
104
105
106 --
107 Staffan Ulfberg <staffan@ulfberg.se>